SnotNose: A comment on this solution: -
make an L+1 group with a weak leg. It has the same status as an L+1 group with a strong leg (one in which
is a Black stone): Black can live, White can kill. Since White must play
, Black lives with
. I believe this is the correct solution.
unkx80: This is a dead L group. If at
, then White still plays
, and the result is the same.